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A genetically restricted suppressor factor that requires interaction with two distinct targets.

I Aoki, M Usui, M Minami

    Journal of Immunology (Baltimore, Md. : 1950)
    |April 1, 1984
    PubMed
    Summary

    A suppressor factor (TsF3) genetically restricted immune responses by interacting with antigen-presenting cells (APCs). This interaction, dependent on specific genetic markers, bridges APCs and host cells to mediate suppression.

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    Area of Science:

    • Immunology
    • Molecular Biology
    • Genetics

    Background:

    • A genetically restricted suppressor factor, TsF3, has been identified.
    • TsF3 suppresses the terminal phases of the contact sensitivity response.
    • TsF3 activity is restricted by genes within the H-2 (I-J) and Igh complexes.

    Purpose of the Study:

    • To analyze the mechanisms underlying the genetic restrictions of TsF3.
    • To elucidate the cellular targets and interactions of TsF3.

    Main Methods:

    • Analysis of genetic restrictions in immune suppression.
    • Identification of cellular targets of TsF3.
    • Investigation of genetic homology requirements for TsF3 activity.

    Main Results:

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    • TsF3 targets I-J-bearing antigen-presenting cells (APCs) sensitive to cyclophosphamide.
    • I-J homology between APCs and TsF3 donor is required for suppression.
    • Igh-linked restriction involves TsF3 and unprimed recipient cells, suggesting a bridging mechanism.
    • TsF3 mediates bystander or cognate suppression when antigen is present at the T cell response site.

    Conclusions:

    • TsF3 employs a mechanism involving bridging antigen-presenting cells with host cells.
    • Genetic restrictions (H-2 I-J and Igh) dictate TsF3's specific interactions.
    • TsF3's ability to mediate antigen-specific or bystander suppression highlights its regulatory role in T cell responses.